Maideus, Melinda
Facts on File, 1981
Buku Teks
Appleyard, Reginald T., author
IOM, 1991
Buku Teks
Moorehead, Caroline, author
Lieve de Meijer en J.M Meulenhoff bv, 2005
Buku Teks
Castles, Stephen
Macmillan, 1993
Buku Teks
Jakarta Sinar Grafika 2000,
Buku Referensi